Fix failure to display audio analysis in some cases.

Before we were checking existing AnalyseAudioJobs by
their audio analysis path, which may change after they
have been run since they use up-to-date info such
as the Film's processor.

e.g.
Run audio analysis for content.
Enable processor.
Re-run analysis for film; now before it would think that
the existing job has done the *new* analysis because its
path would be the same as the one we now want.

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